It's hard to imagine that stock being that far out of true (5+ degrees is visibly off) but if it is then you need to get it replaced. Do not try to bend it because you might induce internal stresses or cracking in a part that you definitely don't want to fail. I have to say that the stock I received in my kit was just fine, but that was 10 years ago.

I received a very strange official answer from Vans. It reports exactly:

".... The mill specs for that angle are pretty broad – it is often not exactly 90 degrees as we receive it from the supplier. If you wish, you can open the angle up slightly by squeezing it in a vice (padded with wood), but it is not critical and would be OK as it is when bolted down to the fuselage later."

I'm very worried about: more than 5 degrees that can be seen by eye and it is too much for anything.

Mine were a bit less than 90deg thus the trailing edge was the only part making contact on the spacers. I was worried about the spacers walking around while drilling. I too contacted Van's support and they said that I could attempt to open up the bend in the angle some but since it was already riveted to the HS spar that I would need to block the spar so as not to bend the spar web.

I made some wood blocks to support the spar web and used a large crescent wrench to open the angle some. I did not feel comfortable applying enough force with the wrench to open the angle up all that much. It was a bit better after the exercise but not worth the hassle.

Turns out that carpet tape is thick enough that it filled the void reasonably between the spacers and the angle and drilling the bolt holes was a non issue. Once bolted down everything mates up fine without any gaps between the spacers and the HS attach brackets. Torqueing the bolts down closed the gaps easily without using anything other than normal torque.

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